package com.boruan.shengtangfeng.core.utils;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;
 
public class CookieUtil {
 
    private final static String COOKIE_NAME = "login_token";
 
 
    public static String readLoginToken(HttpServletRequest request){
        Cookie[] cks = request.getCookies();
        if(cks != null){
            for(Cookie ck : cks){
                if(StringUtils.equals(ck.getName(),COOKIE_NAME)){
                    return ck.getValue();
                }
            }
        }
        return null;
    }
 
    public static void writeLoginToken(HttpServletResponse response, String token,int maxAge){
        Cookie ck = new Cookie(COOKIE_NAME,token);
        ck.setPath("/");//代表设置在根目录
        ck.setHttpOnly(true);
        //单位是秒。
        //如果这个maxage不设置的话，cookie就不会写入硬盘，而是写在内存。只在当前页面有效。
        ck.setMaxAge(maxAge);//如果是-1，代表永久
        response.addCookie(ck);
    }
 
 
    public static void delLoginToken(HttpServletRequest request,HttpServletResponse response){
        Cookie[] cks = request.getCookies();
        if(cks != null){
            for(Cookie ck : cks){
                if(StringUtils.equals(ck.getName(),COOKIE_NAME)){
                    ck.setPath("/");
                    ck.setMaxAge(0);//设置成0，代表删除此cookie。
                    response.addCookie(ck);
                    return;
                }
            }
        }
    }
    
}
